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The free energy between a static quark and an antiquark is studied by usingthe color-singlet Polyakov-line correlation at finite temperature in latticeQCD with 2+1 flavors of improved Wilson quarks. From the simulations on $32^3\times 12$, 10, 8, 6, 4 lattices in the high temperature phase, based on thefixed scale approach, we find that, the heavy-quark free energies at shortdistance converge to the heavy-quark potential evaluated from the Wilson loopat zero temperature, in accordance with the expected insensitivity of shortdistance physics to the temperature. At long distance, the heavy-quark freeenergies approach to twice the single-quark free energies, implying that theinteraction between heavy quarks is screened.  The Debye screening mass obtained from the long range behavior of the freeenergy is compared with the results of thermal perturbation theory.

Free energies of heavy quarks in full-QCD lattice simulations with Wilson-type quark action